CN204704440U - A kind of unidirectional stop valve - Google Patents

Abstract

The utility model discloses a one-way stop valve, which belongs to the mechanical field and solves the technical problems that the traditional stop valve cannot prevent backflow and has poor practicability. The utility model includes a valve body, a valve seat, a valve disc, a valve stem, a valve cover and a hand wheel. The valve body is provided with an inlet channel and an outlet channel, and the valve seat is arranged between the inlet channel and the outlet channel. The valve disc is set corresponding to the valve seat, one end of the valve stem is fixedly connected with the hand wheel, and the other end is movably connected with the valve disc, the valve cover is socketed with the valve stem, and the valve cover and valve stem are provided with Matching threads, the valve clack is provided with a pin shaft, and the valve rod is provided with a chute corresponding to the pin shaft, and the pin shaft can slide in the chute, and the pin shaft and the Fluid-tight fit of the chute. The utility model has the advantages of simple structure, ability to prevent backflow and strong practicability.

Description

A one-way stop valve

technical field

The utility model belongs to the mechanical field, and relates to a valve, in particular to a one-way stop valve.

Background technique

Globe valve, also known as cut-off valve, is a forced sealing valve. When the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak. The valve disc of the globe valve on the market is generally directly controlled by the valve stem, that is, the valve stem is used to drive the valve disc to move, so as to realize opening and closing of the valve, so this type of globe valve generally does not have the ability to prevent backflow or back suction function.

For example, the Chinese utility model patent No. 201220360146.3 discloses a pressurized stop valve, which includes a valve body, a valve disc, a valve stem, a valve cover, and a driving mechanism. The valve body has an inlet channel and an outlet channel. There is a valve seat between them, and the inlet channel is located on the lower side of the valve seat. The main cavity of the valve body is a piston cylinder, and the back of the disc sealing surface is connected to the piston. The piston and the piston cylinder are dynamic and sealed. A balance hole is formed between the piston chamber and the inlet passage, and a pressure relief hole connecting the piston chamber and the outlet passage is formed on the piston, and a one-way valve leading to the outlet passage is arranged in the pressure relief hole. During the adjustment process of this kind of valve, when the valve is in the open state, that is, when the valve disc is separated from the valve seat, if the fluid on the inlet channel side is used up or the fluid pressure drops at this time, the fluid on the outlet channel side will flow back to the inlet. On the channel side, in order to avoid this situation, when using this shut-off valve, it is often necessary to install a check valve on the pipeline on the outlet channel side, so this shut-off valve has the disadvantages of single function and poor practicability .

Utility model content

The purpose of the utility model is to provide a one-way stop valve with simple structure, capable of preventing backflow and strong practicability.

In order to achieve the above object, the technical solution adopted by the utility model is:

A one-way stop valve, including a valve body, a valve seat, a valve disc, a valve stem, a valve cover and a hand wheel, the valve body is provided with an inlet passage and an outlet passage, and the valve seat is arranged on the inlet passage and the outlet Between the channels, the valve disc is set correspondingly to the valve seat, one end of the valve stem is fixedly connected with the hand wheel, and the other end is movably connected with the valve disc, the valve cover is socketed with the valve stem, and the valve cover and valve The rod is provided with a matching thread, the valve disc is provided with a pin shaft, and the valve rod is provided with a chute corresponding to the pin shaft, and the pin shaft can slide in the chute. The pin shaft is fluid-tightly engaged with the chute.

In the above one-way stop valve, a sealing pad is provided on the side of the valve disc corresponding to the valve seat.

In the above-mentioned one-way stop valve, the side of the valve seat corresponding to the valve flap is provided with a sealing boss, and the sealing boss corresponds to the position of the sealing gasket.

In the above-mentioned one-way stop valve, the side of the valve flap corresponding to the valve seat is provided with a mounting column, and the sealing gasket is sleeved on the mounting column.

In the above one-way stop valve, the valve seat is arranged in the valve body along the horizontal direction, the inlet channel is located on the lower side of the valve seat, and the outlet channel is located on the upper side of the valve seat.

In the above-mentioned one-way stop valve, an expansion spring is sheathed on the valve stem, one end of the expansion spring is connected with the valve clack, and the other end is connected with the valve cover.

The beneficial effects of the utility model are: by adding a pin shaft on the valve disc, and setting up a chute corresponding to the pin shaft on the valve stem, the pin shaft can slide in the chute at the same time, and the pin shaft It cooperates with the chute liquid seal, so that it can be realized that when the fluid on the side of the inlet channel is used up or the pressure of the fluid is reduced, at this time, because the fluid pressure on the side of the outlet channel is higher than that on the side of the inlet channel, the pressure of the fluid on the side of the outlet channel Under the action, a pressure will be applied to the valve disc to press the valve disc tightly on the valve seat, that is, the self-closing of the valve can be realized under the action of the fluid on the outlet channel side, so the utility model not only has the function of shutting off, It also has the function of preventing backflow, so the utility model has the advantages of simple structure, ability to prevent backflow and strong practicability.

Description of drawings

Fig. 1 is the structural representation of the utility model first embodiment;

Fig. 2 is a partial enlarged view of area A in Fig. 1;

Fig. 3 is a schematic structural view of the second embodiment of the utility model.

Detailed ways

In order to have a further understanding and understanding of the structural features of the present utility model and the achieved effects, a detailed description will be provided in conjunction with preferred embodiments and accompanying drawings, as follows:

Fig. 1 and Fig. 2 have provided the first embodiment of the present utility model, and in this embodiment, a kind of one-way shut-off valve of the present utility model comprises valve body 1, valve seat 2, valve clack 3, valve stem 4, The valve cover 5 and the handwheel 6 are provided with an inlet channel 11 and an outlet channel 12 in the valve body 1 , and the valve seat 2 is arranged between the inlet channel 11 and the outlet channel 12 . More specifically, in this embodiment, the valve seat 2 is arranged in the valve body 1 along the horizontal direction, the inlet channel 11 is located on the lower side of the valve seat 2 , and the outlet channel 12 is located on the upper side of the valve seat 2 .

The valve disc 3 is arranged corresponding to the valve seat 2. In this embodiment, the valve disc 3 is arranged directly above the valve seat 2, on the side corresponding to the valve disc 3 and the valve seat 2, that is, under the valve disc 3. A mounting column 32 is provided on the side, and a sealing gasket 7 is sleeved on the mounting column 32 . Correspondingly, on the side of the valve seat 2 corresponding to the valve disc 3, that is, on the upper side of the valve seat 2, a sealing boss 21 is provided, and the sealing boss 21 corresponds to the position of the gasket 7 on the valve disc 3. , through the cooperation of the sealing boss 21 on the valve seat 2 and the gasket 7 on the valve disc 3, a better sealing effect between the valve disc 3 and the valve seat 2 can be achieved.

One end of the valve stem 4 is fixedly connected with the hand wheel 6 through screws, and the other end is movably connected with the valve disc 3. The valve cover 5 is socketed with the valve stem 4, and the valve cover 5 and the valve stem 4 are provided with matching threads. , so by rotating the handwheel 6, it is possible to control the movement of the valve stem 4 in the vertical direction, that is, to drive the valve disc 3 to move in the vertical direction. A pin shaft 31 is provided on the valve disc 3, and a chute 41 corresponding to the pin shaft 31 is opened on the valve stem 4. The pin shaft 31 can slide along the chute 41 in the vertical direction, and the pin shaft 31 cooperates with this chute 41 liquid-tight. the

During the use of the utility model, when the valve is in an open state, that is, when the valve disc 3 is separated from the valve seat 2, if the pressure of the fluid in the inlet channel 11 is greater than the pressure of the fluid in the outlet channel 12, the valve disc 3 Under the upward pressure of the fluid in the inlet channel 11, the valve disc 3 continues to separate from the valve seat 2, so the valve remains in an open state; while the pressure of the fluid in the inlet channel side 11 decreases, that is, the pressure of the fluid in the inlet channel 11 is lower than that of the outlet channel When the pressure of the fluid in 12, at this time, the valve disc 3 will be subjected to the downward pressure of the fluid in the outlet passage 12, so that the valve disc 3 is pressed tightly on the valve seat 2, so the action of the fluid in the outlet passage 12 at this time Next, the self-closing of the valve can be realized to prevent the backflow of the fluid on the outlet channel 12 side. Therefore, the utility model not only has the function of cut-off, but also has the function of preventing backflow, so the utility model has the advantages of simple structure, ability to prevent backflow and strong practicability.

Fig. 3 has provided the second embodiment of the present utility model, and in this embodiment, the structure and The above-mentioned first embodiment is the same, and correspondingly it also has the above-mentioned technical effect. Different from the first embodiment above, in this embodiment, an expansion spring 8 is sheathed on the valve stem 4, one end of the expansion spring 8 is connected with the valve disc 3, and the other end is connected with the valve cover 5, Through the action of the expansion spring 8, the valve disc 3 can be subjected to a downward elastic force, so that only when the pressure of the fluid in the inlet passage 11 is greater than the pressure of the fluid in the outlet passage 12, the valve is in an open state; When the pressure of the fluid in the inlet channel 11 is less than or equal to the pressure of the fluid in the outlet channel 12 , the valve will be self-closing, so as to better prevent the backflow of the fluid in the outlet channel 12 .

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the industry should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions describe only the principle of the utility model. There will be various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The protection scope required by the utility model is defined by the appended claims and their equivalents.

Claims (6)

1. A one-way stop valve, comprising a valve body, a valve seat, a disc, a valve stem, a valve cover and a hand wheel, the valve body is provided with an inlet channel and an outlet channel, and the valve seat is located at the inlet channel and between the outlet channel, the valve disc is set corresponding to the valve seat, and it is characterized in that one end of the valve stem is fixedly connected with the handwheel, and the other end is movably connected with the valve disc, and the valve cover is socketed with the valve stem. The bonnet and the valve stem are provided with matching threads, the valve disc is provided with a pin shaft, and the valve stem is provided with a chute corresponding to the pin shaft, and the pin shaft can be placed on the slide sliding in the groove, and the pin shaft is fluid-tightly engaged with the sliding groove. 2. A one-way stop valve according to claim 1, characterized in that a sealing gasket is provided on the side of the valve flap corresponding to the valve seat. 3. A one-way stop valve according to claim 2, characterized in that, the side of the valve seat corresponding to the valve disc is provided with a sealing boss, and the position of the sealing boss and the gasket Corresponding. 4 . The one-way stop valve according to claim 2 , wherein a mounting post is provided on the side of the valve flap corresponding to the valve seat, and the gasket is sleeved on the mounting post. 5 . 5. A one-way stop valve according to claim 1, wherein the valve seat is arranged in the valve body along the horizontal direction, the inlet channel is located on the lower side of the valve seat, and the outlet channel is located on the lower side of the valve seat. on the upper side. 6. A one-way stop valve according to any one of claims 1 to 5, characterized in that an expansion spring is sheathed on the valve stem, one end of the expansion spring is connected to the valve clack, and the other is One end is connected to the valve cover.